In the present edition of the *Philosophical Notebooks*, the materials from the *Notebook on Philosophy* are placed in two sections: summaries and fragments—in the first (p. 41-332), notes on books, articles and reviews—in the second (p. 346-358); in both cases the most probable chronological sequence of documents has been preserved, with the exception, as stated above, of the Summary of Feuerbach's book on the philosophy of Leibniz. - 41
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